Quick Answer
The answer is `zcat archive.tar.gz | tar -t`, which lists the contents of a tar.gz file without extracting it to disk. This works because `zcat` decompresses the gzip layer in memory and pipes the resulting uncompressed tar stream directly into `tar -t`, where the `-t` flag tells tar to display the file table without performing an actual extraction. On the Linux Foundation Certified System Administrator LFCS exam, this question tests your understanding of combining stream-based tools rather than relying on intermediate files—a common trap is choosing `tar -xzf` (which extracts) or `tar -ztf` (which works but is less portable across older systems). The key concept is that `zcat` handles the decompression, while `tar -t` handles the listing, keeping everything in the pipeline. Memory tip: think "zcat pipes, tar lists"—the `z` in `zcat` is for gzip, and `-t` is for table, so you never touch the disk.
This LFCS practice question tests your understanding of essential commands. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A technician needs to display the contents of a compressed file named archive.tar.gz without extracting it. Which command should be used?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
tar -tf archive.tar
Why wrong: Used for uncompressed tar files.
tar -xzf archive.tar.gz
Why wrong: Extracts files, does not just list.
zcat archive.tar.gz | tar -t
Decompresses and pipes to tar -t to list contents.
zcat archive.tar.gz
Why wrong: Only decompresses, does not list tar contents.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
zcat archive.tar.gz | tar -t
Option C is correct because it uses `zcat` to decompress the `.gz` layer on the fly and pipes the resulting uncompressed tar archive into `tar -t`, which lists the contents without extracting. This allows viewing the file listing without first decompressing to disk, satisfying the requirement to display contents without extraction.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
tar -tf archive.tar
Why it's wrong here
Used for uncompressed tar files.
tar -xzf archive.tar.gz
Why it's wrong here
Extracts files, does not just list.
zcat archive.tar.gz | tar -t
Why this is correct
Decompresses and pipes to tar -t to list contents.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
zcat archive.tar.gz
Why it's wrong here
Only decompresses, does not list tar contents.
Common exam traps
The trap here is that candidates may confuse `tar -tf` (which works only on uncompressed tar files) with `tar -ztf` (which handles gzip), or they may mistakenly think `zcat` alone produces a readable listing, when it actually outputs raw binary tar data.
Detailed technical explanation
The `tar -t` option lists the table of contents of a tar archive without extracting. When combined with `zcat` (or `gunzip -c`), the pipeline decompresses the gzip-compressed stream in memory, allowing `tar` to read the uncompressed tar data. This is equivalent to `tar -ztf archive.tar.gz` on systems where `tar` supports `-z` natively, but the pipeline approach works even if `tar` lacks gzip support. In real-world scenarios, this technique is useful for inspecting large compressed archives without consuming extra disk space for decompression.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the LFCS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Essential Commands — This question tests Essential Commands — Read the scenario before looking for a memorised answer..
The correct answer is: zcat archive.tar.gz | tar -t — Option C is correct because it uses `zcat` to decompress the `.gz` layer on the fly and pipes the resulting uncompressed tar archive into `tar -t`, which lists the contents without extracting. This allows viewing the file listing without first decompressing to disk, satisfying the requirement to display contents without extraction.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This LFCS practice question is part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LFCS exam.
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